How can I run wordpress php files in a subdomain?

Question

I'm trying to install wordpress 3.9.1 in a subdomain, I know it works because I have the same version in localhost using XAMPP. The subdomain is working (I tested it with html and php files), but no wordpress file is running, I only get blank pages (not errors, just blank pages). The databases are created, the wp-config.php is edited and the privileges are granted, but still I cannot get the wordpress files to run. This is my configuration:

OS: CentOS 6.5 Provider: Digital Ocean PHP: 5.3.3 Apache: 2.2.15

my VirtualHost looks like this:

<VirtualHost *:80>
  ServerName blog.domain.com
  DocumentRoot /var/www/blog/
  <Directory "/var/www/blog/">
    Options Indexes FollowSymlinks
    AllowOverride None
    Order allow,deny
    Allow from all
  </Directory>
</VirtualHost>

Answer 1

To configure wordpress subdomain as you need:

1) configure the virtualhost, example

<VirtualHost *:80>
ServerAdmin you@domain.com
DocumentRoot "/var/www/blog/"
ServerName blog.domain.com
ErrorLog "/var/log/blog.domain.com-error_log"
CustomLog "/var/log/blog.domain.com-access_log" common
<Directory "/var/www/blog/">
    Options +Includes
    AllowOverride all
</Directory>

2) Configure wordpress to use the subdomain:

Place the following line of code to the end of the file wp-config.php

define('WP_HOME', 'http://blog.domain.com');
define('WP_SITEURL', 'http://blog.domain.com');